4.7 Article

Linking separation sharpness with the characteristics of axial velocity wave zone in a hydrocyclone

期刊

POWDER TECHNOLOGY
卷 386, 期 -, 页码 467-482

出版社

ELSEVIER
DOI: 10.1016/j.powtec.2021.03.070

关键词

Hydrocyclone; Classification; Separation sharpness; Axial velocity wave zone; Force analysis

资金

  1. National Natural Science Foundation of China [51874075,51974066]
  2. State Key Laboratory of Process Automation in Mining Metallurgy [BGRIMMKZSKL201812]
  3. China Scholarship Council

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The axial velocity wave zone in hydrocyclones plays a critical role in separation sharpness, which is influenced by geometric parameters. Improving the symmetry of flow field and optimizing the spatial distribution of this zone can enhance separation sharpness.
Maximizing separation sharpness is critical for the design and operation of hydrocyclones but remains difficult to achieve. This work presents a numerical study on the relationship between separation performance and the characteristics of axial velocity wave zone to understand the reasons for the limited separation sharpness. The results showed that this zone is featured as an inherent transition region, with extensive secondary vortices formed between inner and outer spiral flows. The presence of this zone adversely affects the fluid-solid momentum transfer, causing prolonged residence time and accumulation of intermediate-sized particles. The separation sharpness shows a strong dependence on the characteristics of axial velocity wave zone, which are further controlled by geometric parameters. Increasing the symmetry of flow field and optimizing the spatial distribution of this zone can help increase the separation sharpness while its size shows little effect. (c) 2021 Published by Elsevier B.V.

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